From the page: "Most winters you get a few displays of the Aurora Borealis in Orkney, though they're not often as bright as this. The Orkney name for them is the Merry Dancers, which my father believes should be Mirri Dancers, the Orkney word for hazy or blurred.
It used to be believed that red Merry Dancers were a sign of war and vivid displays are said to have been seen before both World Wars."